Title: Insect spiracle Magnification : 50x Image : spiraclec.jpg
Text: The large brown oval at the bottom of the image is a spiracle: an opening in the exoskeleton of an insect that allows air into the body. Visible at the top of the image are the tracheal tubes that carry this air to the internal organs. The other image shows the tracheal tubes branching as they leave the spiracle.
Title: Tunicate larva Magnification : 50x Image : tunicate.jpg
Keywords : animals, tunicate, larva, chordate
Text: Tunicates, or sea squirts, are the simplest chordates. They are invertebrate, yet in the larval stage, shown here, they have all the characteristics of a chordate. The other image shows the tail of the larva.
Click here to see another view. (50x)
Title: Obelia Magnification : 50x Image : obelia.jpg
Keywords : animals, Cnidaria, obelia, polyp
Text: Obelia is in the phylum Cnidaria, and is colonial. The middle of the image shows a feeding polyp, with tentacles that have stinging cells to capture prey. The other image shows a large reproductive polyp, which is filled with medusa. The medusa stage can swim like jellyfish, and spread the Obelia to new areas.
Title: Rotifers Magnification : 50x Image : rotifer.jpg
Keywords : animals, rotifer, corona
Text: Rotifers are small, often less than 1mm long, but relatively complicated. They are found in freshwater, such as ponds, bird baths, rain gutters etc. The dark area on the top right is the corona, a circle of cilia which sweeps food into the mouth. The central area of the body contains digestive and reproductive organs. The tail-like base is called the foot, and attaches the rotifer to a solid surface
Title: Taenia Magnification : 50x Image : taenia.jpg
Keywords : animals, scolex, taenia, tapeworm
Text: This shows the top, or scolex, of a tapeworm. The hooks on the left of the image allow the tapeworm to hold onto the sides of the intestines. The bulge at the top is one of the four suckers that provide additional adhesion.
Title: Snail radula Magnification : 50x Image : radula.jpg
Keywords : animals, snail, mollusca, radula
Text: The radula is covered with small horny teeth made of chitin, called denticles, that
grind the food into pieces. New denticles are constantly being produced to
replace those worn away at the front. Snails may be herbivorous or carnivorous,
predatory or parasitic.
Click here to see higher magnification. (100x)
Title: Trichinella Magnification : 50x Image : trichinella.jpg
Keywords : animals, roundworm, trichinella, pork,
parasite
Text: This shows muscle that is infected with the parasitic roundworm Trichinella (the worm is coiled up in the middle of the photo). The other image shows a female worm removed from the muscle.
Click here to see another view. (50x)
Title : Whitefish blastula : mitosis Magnification : 100x Image : blastula.jpg
Text : The blastula is a round ball of cells that forms early in the development of an animal. It is produced by mitosis from the original fertilized egg. Each blastula consists of roughly 60 – 200 cells. Most of the cells are in interphase, but some are dividing by mitosis.
Metaphase: the chromosomes are lined up in the center of the spindle (1000x)
Anaphase: the chromosomes separated into two groups and pulled by the spindle to opposite ends of the cell (1000x)
Title : Lumbricus cross section Magnification : 20x Image : lumbric20.jpg
Text : This
a cross section through an earthworm. Inside the epidermis are the circular and
longitudinal muscles. The ”U” shape near the center is the intestine , with
the typhlosole (fold) hanging down into the intestine. The circle near the top
center is the dorsal blood vessel. This is shown more clearly under higher
magnification.
Click here to see higher magnification (40x)
Title : Amblyomma (tick) Magnification : 40x Image : amblyo40.jpg
Keywords : arthropoda, tick, arachnid
Text : This
shows the head of a tick. Ticks suck the blood of mammals and birds, and can
transmit diseases such as ehrlichiosis and Rocky Mountain spotted fever. Like
other arachnids, ticks have a total of 8 legs. The four legs on one side of the
body are shown in the other image. You can see the characteristic joints of the
legs, which is typical of all arthropods.
Click here to see legs (40x)
Title : Enterobius Magnification : 40x Image : enterobius.jpg
Keywords
: roundworm, nematoda
Text : This lovely roundworm (black and white image) is one of the most common parasites of children in the US, with infection rates estimated as high as 30%. It lives in the rectum, and female worms crawl out of the anus at night to lay their eggs on the buttocks. The eggs are itchy, and when children scratch themselves the eggs get on the hands and can be transmitted to toys, door handles etc and spread to other people. Eggs can also be breathed in, so the infection can spread rapidly in schools.
Title: Clonorchis
Magnification : 40x
Image : clonorchisa.jpg
Keywords : flatworm, fluke, Trematoda, platyhelminth
Text: This shows the front of a Chinese liver fluke. The mouth is at the top, with the intestine splitting in two to form a “Y” shape. The dark coils at the bottom are the uterus.
The second image shows the center of the body, with the
uterus and the two branches of the intestines towards the side
Click here to see
middle of the body.
Text: The third image shows the end of the body,
which contains the testes.
Click here to see end
of the body.
Title: Cyclops
Magnification : 40x
Image : cyclops.jpg
Keywords : copepod, arthropod, crustacean, plankton
Text: Cyclops is a copepod, which is a small
crustacean that is an important part of the plankton in the ocean. This is a
female, the high magnification shows the two egg masses attached to the body
near the tail.
Click here to see higher magnification. (100x)
Title: Sponge gemmules
Magnification : 40x
Image : gemmule.jpg
Keywords : sponge, asexual, porifera
Text: Sponges reproduce asexually by releasing
clusters of cells called gemmules. They are surrounded by unique spicules. The
two dark circles in this image are gemmules, the needle–like structures around
them are spicules from the main sponge. Notice under high magnification that the
spicules around the gemmules are different from the regular straight spicules.
Click here to see higher
magnification. (100x)
Title: Schistosoma
Magnification : 20x
Image : schisto20.jpg
Keywords : schistosomiasis, cercaria, fluke
Text: This parasite causes the disease schistosomiasis, which affects about 200 million people in the tropics. The larval stage (cercaria) is found in freshwater and can burrow through the skin. The adult flatworms live in the blood near the intestines. The female (top right, thinner) lives in a groove in the body of the male (top center, wider body).
The other image shows a male fluke, around the mouth you
can see the sucker that he uses to attach to the blood vessel walls.
Click here to see another
image. (40x)
Title: Scypha
Magnification : 100x
Image : scypha.jpg
Keywords : sponge, syconoid, choanocyte, osculum
Text: This is a longitudinal section through the sponge Scypha. The body wall is folded to form pockets, which means that water entering the sides of the sponge travels in an “S” shaped pattern. This is typical of syconoid sponges, and it allows the collar cells (choanocytes) to filter small food particles out of the water. The water leaves the sponge through the large opening, or osculum, at the top.
The other image shows a cross section through Scypha. The center
of the image is the middle of the sponge, and you can see the pockets around the
side. The small pink ovals inside the sponge are eggs.
Click here to see cross
section
Title: Commercial sponge
Magnification : 40x
Image
: comm40.jpg
Keywords : sponge, leuconoid
Text: Commercial sponges are leuconoid. Water enters
canals that lead to chambers surrounded by collar cells, which filter out the
food. They also have spicules made of flexible
spongin (protein), in contrast to the hard calcium carbonate or silica found in
the spicules of other sponges. In Florida sponges are harvested off Tarpon
Springs.
Title: Aurelia Magnification : 100x Image : planula.jpg
Keywords : jellyfish, Cnidaria, scyphozoa
Text: This shows the larval stage of a jellyfish
This planula larva swims around using cilia (not visible in this image).
Eventually this settles at the bottom of the ocean and later produces the ephyra,
which in turn grows into the adult medusa (jellyfish).
Click here to see ephyra (40x)
Title: Hydra
Magnification : 40x
Image : hydra.jpg
Keywords : Cnidaria, hydrozoa
Text: Hydra is unusual in having only a polyp
stage (it remains attached to the bottom). Like the other Cnidaria it has
stinging cells to kill its prey – in Hydra these are on the tentacles.
Once captured, the tentacles push the prey
into the center of the body (the gastrovascular cavity) where it is
digested. The basal disc at the bottom of the hydra attaches it to the
substrate.
Title: Anopheles (mosquito)
Magnification : 40x
Image : anoph.jpg
Keywords : insect, mosquito, mouthparts
Text: This shows the biting mouthparts of a
mosquito. The tube like proboscis penetrates the skin. The hairy structures are
the antenna, and the maxillary palps are to the side. Only female mosquitoes
drink blood (males feed on nectar). This genus of mosquito transmits malaria,
yellow fever and dengue fever.
Title: Branchiostoma (Amphioxus) Magnification : 20x
Image : branchi20.jpg
Keywords : chordata, cephalochordate, lancelet
Text: This shows the front part of a lancelet. The
mouth is surrounded by small tentacles, and the parallel lines are the gill
slits. The notocord and nerve cord are dorsal (running down the back, not the
belly). These are shown in more detail at higher magnification.
Click here to see higher
magnification (40x)
There is also a view of the cross section, which shows the
muscles at the top (to the sides), the notochord at the top center (outlined in
yellow), the intestine in the middle (purple with white center), and the two
ovaries near the bottom (red).
Click here to see cross
section
Title: Ascaris
Magnification : 40x
Image : ascaris40.jpg
Keywords : roundworm, nematoda
Text: Ascaris (lungworm) is a parasitic
roundworm that loves to travel. The eggs are typically eaten in unwashed fruit
or vegetables, and the larva then moves through the blood to the lungs where it
molts, climbs up the air passages and then drops back down the throat to the
intestines. This shows a cross section of the pharynx of Ascaris . inside
the cuticle is the epidermis (skin) then a thin layer of longitudinal muscles.
The center is the muscular pharynx, with a triangular opening.
Click here to see higher
magnification (100x)
A cross section near the middle of the body shows the sperm
ducts of the male (pink, filled ovals), and the intestine (pink circle with
white center).
Click here to see cross
section
Title: Nereis parapodia
Magnification : 20x
Image
: nereis20.jpg
Keywords : annelida, polychaete
Text: The clamworm (Nereis) swims using
parapodia that stick out of the side of each segment of the body. Parapodia are
important in movement, and also increase the surface area to absorb oxygen from
the water. The two dark lines are setae.
Title: Crepidula veliger larva
Magnification : 20x
Image : crepidula.jpg
Keywords : mollusca, limpet
Text: This shows the veliger larval stage of the
mollusc Crepidula fornicata (slipper limpet). The adult limpets grow in
colonies, with females on the bottom and males on the top. As males mature they
change gender, and turn into females.
Title: Asterias larva
Magnification : 40x
Image
: bipinn40.jpg
Keywords : starfish, Echinodermata, bipinnaria
Text: Although adult starfish have radial symmetry,
the bipinnaria larva have bilateral symmetry. The dark line in the larva is the
digestive system, running from the mouth to the anus. This is seen in more
detail in the high magnification view.
Click here to see higher
magnification (100x)
Title: Insect compound eye
Magnification : 40x
Image
: eye40.jpg
Keywords : hexapoda, arthropoda, ommatidia
Text: Unlike your eye, the compound eye of an insect
consists of many separate units, called ommatidia. A single eye often has
hundreds of ommatidia, and each ommatidia sends a signal to the brain. The
ommatidia are arranged vertically on the left of this image, the small clear
ovals near the surface of the eye are the individual lenses (one for each
ommatidium). The compound eye does not produce as clear an image as the human
eye, but it is better at detecting movement.
Click here to see higher
magnification (100x)
